Stuck in a dilemma, unsure of what i want.?

A year ago, my girlfriend for a year and a half and i decided to break it off because we felt disconnected. She lives in my hometown and i live about 1-hour bus ride away but i was dedicated to see her every weekend. Now, having completely different lives, we are finding out that we want to be together again and we still have the same feelings. We met up and everything felt the way it used to, which is a good thing but after we concluded that our lives are not the same as they used to be, we talk to new people, we have different priorities but we still care so much for each other. I've realized that if i go back, then i'm just going to be dragged into the old city that really has no good for me and it would be hard to balance the new social life i created here since we've broken up. Something deep inside is telling me that she's the only i can be happy with, and i've tried to feel the same way with different girls but it just doesn't meet the happiness i have with her. What is happening and what am i supposed to do? Just for the record, we are both going to be seniors in high school next year. Thank you.